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Help CenterQ235B Carbon Steel Pipe ERW Welded 1 To 12 Inch OD 21.3-323.9mm Black Finish 6 Meter Standard Length
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Welcome to Hemaokang Steel (Shandong) Co., Ltd., a professional manufacturer and exporter based in Liaocheng, Shandong, China. Our Q235B Carbon Steel ERW Welded Pipe combines reliable material properties, efficient welding technology, and a clean black finish to serve a broad range of industrial and structural applications. With an annual export value of US$50–100 million, we are a dependable source for customers looking for high-quality carbon steel pipes at competitive prices. We take pride in offering 1–12 inch outer diameter pipes with a standard length of 6 meters.
1. Q235B Material Advantages
Q235B is a widely used carbon structural steel in China and many other markets. It offers a minimum yield strength of 235 MPa, good tensile strength, and excellent ductility, making it suitable for welded constructions and general engineering purposes. The material can be easily cut, bent, welded, and machined, which reduces processing costs for manufacturers and fabricators. Its stable chemical composition ensures predictable behavior during welding, and its mechanical properties remain consistent under normal working conditions. This balance of strength and affordability makes Q235B a common choice for large-scale infrastructure projects, machine frames, and fluid pipelines.
2. ERW Welding Technology
Our pipes are produced using ERW (Electric Resistance Welding), a highly efficient welding method for longitudinal seam pipes. During the process, the edges of the steel strip are heated by high-frequency electric current and pressed together to form a solid weld. This technique creates a weld seam with good density and a smooth appearance, while allowing precise control of pipe dimensions. Compared to seamless pipes, ERW pipes offer lower cost, better surface finish, and tighter dimensional tolerances. They are widely accepted in low-pressure fluid transportation, structural columns, scaffolding, and mechanical applications. The weld integrity is maintained by careful process control and regular testing.
3. Dimensions and Specifications
| Material | Q235B carbon steel |
| Manufacturing Method | ERW (Electric Resistance Welding) |
| Outer Diameter | 21.3 – 323.9 mm (1 – 12 inch) |
| Wall Thickness | Customizable upon request |
| Standard Length | 6 meters |
| Surface Finish | Black finish |
| Pipe End | Plain ends standard; beveled ends optional |
| Section Shape | Round |
4. Black Finish and Standard Length
The black finish on this pipe provides a uniform, dark appearance that helps protect the surface during handling, storage, and transport. It is suitable as a base layer for painting, galvanizing, or other anti-corrosion treatments. If you intend to use the pipe outdoors or in a corrosive environment, further surface coating is recommended and can be arranged. The standard length of 6 meters is convenient for most construction and fabrication tasks, as it reduces the number of joints in a pipeline or frame, saving installation time and consumables. For special projects, we offer custom cutting lengths to meet your exact layout requirements.
5. Key Advantages and Benefits
- High strength with low cost: Q235B offers a good strength-to-cost ratio for general engineering and construction.
- Excellent weldability: The material and ERW process allow for easy welding, threading, and connection on site.
- Dimensional accuracy: Modern ERW lines produce consistent outside diameter, roundness, and wall thickness, minimizing waste during fabrication.
- Large size range: With OD from 21.3mm to 323.9mm, you can source multiple sizes from one supplier.
- Time saving standard length: 6-meter pipes reduce joint counts and accelerate installation progress.
- Flexible customization: Wall thickness, end preparation, and length can be adjusted to meet your project specifications.
- Reliable factory support: As a direct manufacturer and exporter, we offer stable supply, professional packaging, and responsive customer service.
6. Applications
This Q235B ERW welded pipe is widely used in the following fields:
- Building structures and steel frames
- Scaffolding and temporary support systems
- Handrails, guardrails, and fencing
- Low-pressure water and gas pipelines
- Machinery components and conveyor systems
- Support columns and piling foundations
- Roller frames and sunshade structures
- General fabrication and mechanical processing
Thanks to its balanced mechanical properties, this pipe is also suitable for secondary processing such as bending, cutting, drilling, and grooving. It is a versatile product for both indoor and outdoor projects.
Frequently Asked Questions
Q1: What is the outer diameter range of this Q235B ERW pipe?
A: The outer diameter covers 21.3mm to 323.9mm, which corresponds to 1 inch to 12 inch. This range supports a variety of piping and structural applications. For sizes outside this range, please contact us for feasibility.
Q2: Is the pipe available in custom lengths?
A: Yes. While 6 meters is the standard length, we can supply custom lengths according to your project design or transport requirements. Please specify your desired length when requesting a quotation.
Q3: What does black finish mean?
A: Black finish refers to the dark surface condition of the pipe, which comes from the manufacturing process or a black paint layer. This finish provides basic protection and a uniform appearance. Additional coatings such as anti-rust paint, galvanizing, or varnish are available upon request.
Q4: What is the difference between ERW and seamless steel pipe?
A: ERW pipe has a longitudinal weld seam created by electric resistance welding, while seamless pipe has no joints. ERW is generally more economical and offers better dimensional accuracy. Seamless pipes are preferred for very high-pressure applications. For general structural and low-pressure fluid uses, ERW is a practical solution.
Q5: Can I get a sample before placing a large order?
A: Samples are available for pre-order evaluation. Please contact us to confirm sample availability, size, and shipping costs. In many cases, the sample cost can be deducted from the first bulk order.
Q6: What quality controls do you use?
A: Our factory operates an ISO9001 quality management system. During production, we conduct regular checks on dimensions, weld seams, and surface quality. Additional tests such as hydrostatic or third-party inspection can be arranged if needed, but any specific test should be confirmed in advance.
Q7: What is the delivery time?
A: Delivery time depends on the order quantity, specification, and surface treatment. We will confirm an accurate schedule after receiving your inquiry. For standard sizes, the production period is usually shorter, while customized orders may take more time. Please contact us for a precise delivery date.
Q8: What are your shipping and packaging terms?
A: Our port of shipment is Qingdao, China. Pipes are normally bundled with steel straps, with plastic caps or edge protectors to prevent damage. Packaging can be adjusted based on your requirements, including wooden crates or non-woven fabric wrap for sea or rail transportation.
As a reliable steel pipe manufacturer, Hemaokang Steel (Shandong) Co., Ltd. is committed to providing high-quality products and professional service. Our company is located in Liaocheng, Shandong, a well-known steel pipe production hub in China, and we export to markets all over the world. With an annual export value between US$50 million and US$100 million and a dedicated team of 51-100 employees, we have the capacity to fulfill large-volume orders with consistent quality. Our factory is certified under ISO9001, reflecting our focus on systematic quality management. We welcome you to contact us for more information, samples, or a tailored quotation.
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